Connectivity conjecture for the triangle-pseudoline incidence graph
Connectivity conjecture for the triangle-pseudoline incidence graph
A pseudoline arrangement is a finite collection of bi-infinite, simple curves in the Euclidean plane such that every pair crosses exactly once. A triangle-pseudoline incidence graph has as vertices the triangles and pseudolines of the arrangement, with an edge joining a pseudoline to each triangle it supports.
Triangle-pseudoline incidence graph conjecture. The triangle-pseudoline incidence graph of a pseudoline arrangement is connected.
The source notes that the original, weaker conjecture concerned projective arrangements. The status of the stated Euclidean version is not resolved in the supplied text.
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Sources & referencesView supporting material
Primary source
Yan Alves Radtke, Balázs Keszegh and Robert Lauff, “On Triangles in Colored Pseudoline Arrangements”, arXiv:2601.20574 (2026).
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